A "meta-argument" against all future arguments for God's existence ?

[R00tKiT]

Pretty sure you just identified the flaw in your own argument.  It’s not that you think free will would be impossible if you could be stopped.  You argued facetiously to that effect from the first utterance.

You just think nothing would matter, in that case.  

I disagree, and, obviously….the justice systems of developed nations disagree.

It's enough that no atheist ever could prove that evil contradicts benevolence, we don't even need a theodicy of free will.